A tablet that looks perfect on the production line can still fail in the real world — chipping during packaging, crumbling in a blister pack, or turning to powder by the time it reaches a patient. Tablet friability testing is the quality check that catches these problems before they become costly mistakes.
What is Friability?
Friability refers to the tendency of a tablet to chip, crumble, or break under mechanical stress — specifically the kind of stress that occurs during normal handling, packaging, and transport. A friability tester simulates this stress by tumbling tablets inside a rotating drum for a fixed number of revolutions, then measuring the weight loss.
The USP Friability Test Method
The standard test method is defined in USP <1216> and EP 2.9.7. The procedure is straightforward:
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Weigh the tablet sample (typically 6.5g or 20 tablets, whichever is less)
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Load tablets into the drum of the friability tester
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Run the drum at
25 RPM for 4 minutes
(100 revolutions)
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Remove, de-dust, and re-weigh the tablets
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Calculate percentage weight loss
Acceptance limit: Weight loss should not exceed 1.0% for most tablets. Chewable tablets may have higher limits defined in their individual monographs.
Single, Double & Triple Drum Testers — Which Do You Need?
Friability testers come in different configurations depending on throughput:
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Single drum
— tests one batch at a time. Best for small labs, R&D.
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Double drum
— tests two batches simultaneously. Most popular for QC labs with moderate throughput.
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Triple drum
— tests three batches at once. Ideal for high-volume manufacturing environments.
Raise Lab Equipment's RFT series covers all three configurations, with digital timers, silent DC gear motors, and integrated weight loss calculations built into the software.
Common Causes of High Friability
Understanding why friability fails helps you fix it at the formulation stage:
- Insufficient binder concentration in the granulation
- Over-drying during the granulation process
- Too low compression force during tableting
- Poor particle size distribution
Running a friability test early in the development phase — not just at final batch release — helps formulators identify and correct these issues before scale-up.
Friability vs. Hardness — What's the Difference?
These two tests are often confused but measure different things. Hardness measures resistance to crushing (a direct breaking force). Friability measures surface and edge durability under tumbling — a more realistic simulation of handling. Both tests are required in regulated manufacturing and complement each other well.
Raise Lab Equipment manufactures USP/EP/IP compliant tablet friability testers for pharmaceutical QC labs across India. All instruments come with calibration certificates and IQ/OQ documentation support.
Formula: % Friability = [(Initial Weight − Final Weight) / Initial Weight] × 100
Browse our friability testing products here: https://raiselabequip.com/products/category/friability-testing